Abstract:
The design of gain chips for hybrid integration with photonic integrated circuits (PICs) is studied and highlights the benefits of incorporating at least one reflector in the III-V gain material. Quantum dot (QD)-based gain chips with a multi-mode interference (MMI) reflector (MMIR) offer fabrication simplicity and good performance in the O-band. The inclusion of an MMIR in a ridge waveguide (RWG) laser reduces the threshold current by 87% (6 mA vs 46 mA for 1 mm length) and leads to higher slope efficiency, indicating over 90% mirror reflectivity, as compared to Fabry-Perot structures. Both 1- and 2-port designs will simplify alignment of active and passive waveguides for hybrid integration and are strong candidates for large-scale PIC applications.
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